JPH08174326A - Milling cutter - Google Patents

Abstract

PURPOSE: To provide a milling cutter not needing any positional adjustment relative to an arbor even when its cutting tip is polished. CONSTITUTION: A thread ridge 1d is formed in the outer periphery of a cylindrical body 1, a screw thread 2d engaged with the screw thread 1d of the body 1 is formed in the inner peripheral surface of an annular cutting part 2 having a cutting tip 3 for cutting one end surface, a key 5 is fitted in a key way 1e formed in a flange 1c on the other end side of the body 1 and a key way 2e formed in the other end surface of the cutting part 2 so as to be freely attached/ detached and this key 5 is fixed to the body 1 by a bolt 6.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a milling cutter.

[0002]

2. Description of the Related Art When deciding the width of a crankcase formed in a cylinder block of an automobile engine, a plurality of milling cutters are assembled on an arbor for machining in order to improve efficiency. A milling cutter used in such a case is shown in FIG.

As shown in FIG. 4, on the outer peripheral surface of the body 21, a plurality of cutting edges 23 for cutting one end face side are formed at equal intervals in the circumferential direction. A plurality of chips 24 are attached to one end surface of the body 21 at equal intervals in the circumferential direction. By mounting a plurality of such milling cutters on the arbor and rotating them, it is possible to collectively determine the widths of the crankcases of the cylinder blocks of the plurality of cylinders. In FIG. 4, 21a is a milling hole into which the arbor is inserted, and 21a.
Reference numeral b is a key groove fitted with a key provided on the arbor.

[0004]

In the above-mentioned milling cutter, when the cutting edge 23 or the tip of the tip 24 is crushed by cutting, if the cutting edge is polished and finished, the cutting edge is worn and shortened, and The relative position of the cutting edge and the body 1 with respect to the direction is displaced. For this reason,
When reassembling the milling cutter to the arbor after polishing, it is necessary to adjust the relative positions of the arbor and the milling cutter with a spacer or the like in accordance with the above-mentioned deviation to set the cutting edge to the initial position.

However, when trying to set the position of the cutting edge as described above, even if the cutting edges 23 of some of the milling cutters and the cutting edges of the chips 24 are polished and finished,
Since it is necessary to adjust the positions of all the milling cutters, not only is it extremely time-consuming to assemble the milling cutters, but also mistakes are likely to occur in the assembly of the milling cutters, and in the worst case, non-standard There is a risk of processing.

Therefore, when the cutting edge 23 or the tip of the tip 24 is crushed, the milling cutter is discarded without polishing the cutting edge and a new milling cutter is mounted on the arbor. The cost of processing is very high.

[0007]

A milling cutter according to the present invention for solving the above-mentioned problems is provided with a cylindrical body having a thread formed on the outer peripheral surface thereof and a cutting edge for cutting one end surface side thereof. An annular blade portion having an inner peripheral surface on which a screw thread to be screwed with the screw thread of the body is formed, and a fixing means for fixing the body and the blade portion in the circumferential direction. Characterize.

The milling cutter according to the present invention is characterized in that the fixing means is a key fitted into a key groove formed in the other end surface of the body and a key groove formed in the other end surface of the blade portion. To do.

The milling cutter according to the present invention is characterized by including a bolt for fixing the key to at least one of the body and the blade.

[0010]

According to the milling cutter of the present invention configured as described above, since the body and the blade portion are screwed together, the cutting edge of the blade portion can be obtained by relatively rotating the body and the blade portion. Can be projected more than the body. Since the body and the blade portion are fixed by the fixing means, the blade portion does not come off from the body even when the milling cutter is rotated.

If the fixing means is the key as described above, the body and the blade can be fixed and opened easily.

If the above-mentioned bolts are provided,
The key will not fall off during cutting.

[0013]

1 to 3 show an embodiment of a milling cutter according to the present invention.
Will be explained. 1 is a rear view of FIG.
1 is a sectional view taken along the line II-II of FIG. 1, and FIG.
FIG. 3 is a sectional view taken along the line III-III.

As shown in FIGS. 1 and 2, a cylindrical body 1 in which a key groove 1b is formed on the peripheral edge of a milling hole 1a is provided with a flange 1c on the back side of its outer peripheral surface. A thread 1d is formed on the front side of the outer peripheral surface of the body 1.

On the other hand, in the annular blade portion 2 in which a plurality of cutting edges 3 for cutting the front surface, which is one end surface side, are formed on the outer peripheral surface at equal intervals in the circumferential direction, a chip 4 is provided on the front surface which is one end surface. Multiple units are attached at equal intervals in the circumferential direction. On the inner peripheral surface of the blade portion 2, a screw thread 2 which is screwed with the screw thread 1d of the body 1 is formed.
d is formed. On the back surface of the blade 2, the body 1
A circular recess 2c that fits with the flange 1c is formed. That is, the thread 1d of the body 1 and the thread 2 of the blade 2
The body 1 and the blade portion 2 are integrally fitted by screwing with d, and the body 1 is
The relative positions of the blade portion 2 and the blade portion 2 in the direction along the axis can be adjusted.

As shown in FIGS. 1 and 3, on the rear surface side of the flange 1c of the body 1, two key grooves 1e are radially formed at equal intervals in the circumferential direction. The keys 5 longer than the key groove 1e are fitted into the key groove 1e.

On the other hand, key grooves 2e are radially formed on the back surface between the adjacent cutting edges 3 of the blade portion 2, and the key grooves 1e of the body 1 are formed in the key grooves 2e.
A key 5 projecting from is fitted. That is, the key 5 prevents relative movement of the body 1 and the blade portion 2 in the circumferential direction. In this embodiment, the fixing means is constituted by the key 5 and the like.

Further, screw holes 1f are formed in the bottom of the key groove 1e of the body 1 near the milling holes 1a. A screw hole 5a is formed at one end of the key 5. Bolts 6 for fixing the key 5 to the body 1 are respectively screwed into the screw holes 5a of the key 5 and the screw holes 1f of the body 1. In other words, bolt 6
The key 5 is prevented from falling out of the key grooves 1e and 2e.

In such a milling machine, an arbor is inserted into the milling hole 1a of the body 1, the key provided on the arbor and the key groove 1b of the body 1 are fitted, and then the arbor is rotated to perform cutting. Processing can be performed. At this time, the body 1 and the blade portion 2 of the milling cutter are the keys 5
Since it is fixed by, the blade part 2
Does not come off the body 1. Further key 5
Is fixed to the body 1 by the bolts 6, so that the key 5 will not fall out of the key grooves 1e and 2e during cutting.

When the cutting edge 3 of the milling cutter or the cutting edge of the insert 4 is crushed by cutting, the milling cutter is removed from the arbor, and then the bolt 6 is removed to remove the key 5.
Remove. Then, by rotating the body 1 and the blade portion 2 relative to each other, the blade portion 2 is moved to the front side with respect to the body 1, and the cutting blade 3 or the tip 4 is worn according to the degree of wear. 3 and the tip 4 project from the front of the body 1, while the keyway 1e of the body and the keyway 2 of the blade portion 2
e, the key 5 is fitted into the key grooves 1e and 2e and fixed with the bolt 6, and then the cutting edge 3 and the tip 4 are connected.
To a predetermined standard size with a polishing machine.

In other words, by rotating the body 1 and the blade portion 2 relative to each other so that the cutting edge 3 and the tip 4 project beyond the front surface of the body 1, the relative positional relationship between the body 1 and each cutting edge is obtained. Therefore, even if the cutting edge of the cutting edge 3 or the tip 4 is crushed, the relative positional relationship between the body 1 and the cutting edge can be maintained. Can be done.

Therefore, even if a plurality of milling cutters are assembled to the arbor after polishing, it is not necessary to adjust the positional relationship between the milling cutters and the arbor. Not only adjustment is unnecessary, it is not necessary to adjust the position of the polished milling cutter with the arbor, and it can be easily assembled in the same way as the original case, and it is possible to greatly reduce the mistake of assembling the milling cutter to the arbor it can.

Therefore, when the cutting edges 3 and the tips of the chips 4 are crushed, the cutting edges can be ground and the milling cutter can be easily assembled to the arbor, so that the milling cutter can be reused and processed. Such costs can be reduced significantly. Further, since the body 1 and the blade portion 2 are fixed by the key 5, the body 1 and the blade portion 2 can be easily fixed and released, and the work can be performed quickly. Also, since the key 5 is fixed to the body 1 with the bolt 6,
The key 5 does not fall off during the cutting process, and the cutting process can be performed without any problems.

In the embodiment described above, the blade portion 2 having the cutting edge 3 and the tip 4 is used. However, for example, a cutting edge for cutting one end face side such as a single-edged side milling machine or a face milling machine is used. As long as it has a structure, it can be applied in the same manner as the above-mentioned embodiment.

In the embodiment described above, the keyway 1 is formed in the body 1.
Although two e are formed, one may be formed or three or more may be formed. Further, the blade portion 2 is provided with a plurality of key grooves 2e, but when the body is formed with a plurality of key grooves 1, only one may be provided depending on the conditions. In the embodiment described above, the key 5
Is fixed to the body 1 with the bolt 6, but it may be fixed to the blade portion.

[0026]

In the milling cutter according to the present invention, since the body and the blade are screwed together, the cutting edge of the blade can be projected more than the body by relatively rotating the body and the blade. You can Therefore, even if the cutting edge of the cutting edge is polished, the relative positional relationship between the body and the cutting edge of the cutting edge can be maintained, so that relative position adjustment with the arbor or the like due to wear of the cutting edge can be performed. It is completely unnecessary and can be easily assembled.

Further, since the body and the blade portion are fixed by the key, the body and the blade portion can be easily fixed and released, and the work can be performed quickly.

Further, since the key is fixed by the bolt, the key does not fall off during the cutting work, and the cutting work can be carried out without any problem.

[Brief description of drawings]

1 is a rear view of an embodiment of a milling cutter according to the present invention. FIG.

FIG. 2 is a sectional view taken along line II-II of FIG.

3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a front view of an example of a conventional milling cutter.

[Explanation of symbols]

 1 Body 1d Screw thread 1e Key groove 2 Blade part 2d Screw thread 2e Key groove 3 Cutting edge 4 Tip 5 Key 6 Bolt

Claims (3)

[Claims] 1. A cylindrical body having a thread formed on an outer peripheral surface, a cutting edge for cutting one end surface side, and a screw thread formed on an inner peripheral surface to be screwed with the thread of the body. A milling tool comprising: a circular annular blade portion; and a fixing means for circumferentially fixing the body and the blade portion. 2. The key according to claim 1, wherein the fixing means is a key fitted into a key groove formed on the other end surface of the body and a key groove formed on the other end surface of the blade portion. The listed milling cutter. 3. The milling cutter according to claim 2, further comprising a bolt that fixes the key to at least one of the body and the blade portion.